body {
  font-family: "微軟正黑體", sans-serif;
  background: #f5f5f5;
  padding: 20px;
  line-height: 1.6;
}
.title {
  font-size: 36pt;
  font-family: 標楷體;
  text-align: left;
  margin-bottom: 1rem;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}
.section-list, .nested {
  list-style: none;
  padding-left: 0;
}
.section-list > li {
  margin: 0.5rem 0;
  cursor: pointer;
  background: #fff;
  padding: 0.5rem;
  border-radius: 0.5rem;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.nested {
  display: none;
  margin-top: 0.5rem;
  padding-left: 1rem;
}
.collapsible{
  font-size: 24pt;
  font-family: 標楷體;
  text-align: left;
  background-color: none;
}
.collapsible.active > .nested {
  display: block;
  animation: fadeIn 0.3s ease-in;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}